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Johannes Berg8318d782008-01-24 19:38:38 +01001/*
2 * Wireless utility functions
3 *
Johannes Bergd3236552009-04-20 14:31:42 +02004 * Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net>
Johannes Berg8318d782008-01-24 19:38:38 +01005 */
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -04006#include <linux/export.h>
Johannes Bergd3236552009-04-20 14:31:42 +02007#include <linux/bitops.h>
Zhu Yie31a16d2009-05-21 21:47:03 +08008#include <linux/etherdevice.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09009#include <linux/slab.h>
Johannes Bergd3236552009-04-20 14:31:42 +020010#include <net/cfg80211.h>
Zhu Yie31a16d2009-05-21 21:47:03 +080011#include <net/ip.h>
Dave Tähtb1565792011-12-22 12:55:08 -080012#include <net/dsfield.h>
Johannes Berg8318d782008-01-24 19:38:38 +010013#include "core.h"
Hila Gonene35e4d22012-06-27 17:19:42 +030014#include "rdev-ops.h"
15
Johannes Berg8318d782008-01-24 19:38:38 +010016
Johannes Bergbd815252008-10-29 20:00:45 +010017struct ieee80211_rate *
18ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
Johannes Berg881d9482009-01-21 15:13:48 +010019 u32 basic_rates, int bitrate)
Johannes Bergbd815252008-10-29 20:00:45 +010020{
21 struct ieee80211_rate *result = &sband->bitrates[0];
22 int i;
23
24 for (i = 0; i < sband->n_bitrates; i++) {
25 if (!(basic_rates & BIT(i)))
26 continue;
27 if (sband->bitrates[i].bitrate > bitrate)
28 continue;
29 result = &sband->bitrates[i];
30 }
31
32 return result;
33}
34EXPORT_SYMBOL(ieee80211_get_response_rate);
35
Bruno Randolf59eb21a2011-01-17 13:37:28 +090036int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band)
Johannes Berg8318d782008-01-24 19:38:38 +010037{
Bruno Randolf59eb21a2011-01-17 13:37:28 +090038 /* see 802.11 17.3.8.3.2 and Annex J
39 * there are overlapping channel numbers in 5GHz and 2GHz bands */
Vladimir Kondratiev3a0c52a2012-07-02 09:32:32 +030040 if (chan <= 0)
41 return 0; /* not supported */
42 switch (band) {
43 case IEEE80211_BAND_2GHZ:
Bruno Randolf59eb21a2011-01-17 13:37:28 +090044 if (chan == 14)
45 return 2484;
46 else if (chan < 14)
47 return 2407 + chan * 5;
Vladimir Kondratiev3a0c52a2012-07-02 09:32:32 +030048 break;
49 case IEEE80211_BAND_5GHZ:
50 if (chan >= 182 && chan <= 196)
51 return 4000 + chan * 5;
Bruno Randolf59eb21a2011-01-17 13:37:28 +090052 else
Vladimir Kondratiev3a0c52a2012-07-02 09:32:32 +030053 return 5000 + chan * 5;
54 break;
55 case IEEE80211_BAND_60GHZ:
56 if (chan < 5)
57 return 56160 + chan * 2160;
58 break;
59 default:
60 ;
Bruno Randolf59eb21a2011-01-17 13:37:28 +090061 }
Vladimir Kondratiev3a0c52a2012-07-02 09:32:32 +030062 return 0; /* not supported */
Johannes Berg8318d782008-01-24 19:38:38 +010063}
64EXPORT_SYMBOL(ieee80211_channel_to_frequency);
65
66int ieee80211_frequency_to_channel(int freq)
67{
Bruno Randolf59eb21a2011-01-17 13:37:28 +090068 /* see 802.11 17.3.8.3.2 and Annex J */
Johannes Berg8318d782008-01-24 19:38:38 +010069 if (freq == 2484)
70 return 14;
Bruno Randolf59eb21a2011-01-17 13:37:28 +090071 else if (freq < 2484)
Johannes Berg8318d782008-01-24 19:38:38 +010072 return (freq - 2407) / 5;
Bruno Randolf59eb21a2011-01-17 13:37:28 +090073 else if (freq >= 4910 && freq <= 4980)
74 return (freq - 4000) / 5;
Vladimir Kondratiev3a0c52a2012-07-02 09:32:32 +030075 else if (freq <= 45000) /* DMG band lower limit */
Bruno Randolf59eb21a2011-01-17 13:37:28 +090076 return (freq - 5000) / 5;
Vladimir Kondratiev3a0c52a2012-07-02 09:32:32 +030077 else if (freq >= 58320 && freq <= 64800)
78 return (freq - 56160) / 2160;
79 else
80 return 0;
Johannes Berg8318d782008-01-24 19:38:38 +010081}
82EXPORT_SYMBOL(ieee80211_frequency_to_channel);
83
Johannes Berg6c507cd2008-03-26 14:14:55 +010084struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
85 int freq)
Johannes Berg906c7302008-03-16 18:34:33 +010086{
87 enum ieee80211_band band;
88 struct ieee80211_supported_band *sband;
89 int i;
90
91 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
92 sband = wiphy->bands[band];
93
94 if (!sband)
95 continue;
96
97 for (i = 0; i < sband->n_channels; i++) {
98 if (sband->channels[i].center_freq == freq)
99 return &sband->channels[i];
100 }
101 }
102
103 return NULL;
104}
Johannes Berg6c507cd2008-03-26 14:14:55 +0100105EXPORT_SYMBOL(__ieee80211_get_channel);
Johannes Berg906c7302008-03-16 18:34:33 +0100106
Johannes Berg8318d782008-01-24 19:38:38 +0100107static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
108 enum ieee80211_band band)
109{
110 int i, want;
111
112 switch (band) {
113 case IEEE80211_BAND_5GHZ:
114 want = 3;
115 for (i = 0; i < sband->n_bitrates; i++) {
116 if (sband->bitrates[i].bitrate == 60 ||
117 sband->bitrates[i].bitrate == 120 ||
118 sband->bitrates[i].bitrate == 240) {
119 sband->bitrates[i].flags |=
120 IEEE80211_RATE_MANDATORY_A;
121 want--;
122 }
123 }
124 WARN_ON(want);
125 break;
126 case IEEE80211_BAND_2GHZ:
127 want = 7;
128 for (i = 0; i < sband->n_bitrates; i++) {
129 if (sband->bitrates[i].bitrate == 10) {
130 sband->bitrates[i].flags |=
131 IEEE80211_RATE_MANDATORY_B |
132 IEEE80211_RATE_MANDATORY_G;
133 want--;
134 }
135
136 if (sband->bitrates[i].bitrate == 20 ||
137 sband->bitrates[i].bitrate == 55 ||
138 sband->bitrates[i].bitrate == 110 ||
139 sband->bitrates[i].bitrate == 60 ||
140 sband->bitrates[i].bitrate == 120 ||
141 sband->bitrates[i].bitrate == 240) {
142 sband->bitrates[i].flags |=
143 IEEE80211_RATE_MANDATORY_G;
144 want--;
145 }
146
Johannes Bergaac09fb2008-01-30 17:36:10 +0100147 if (sband->bitrates[i].bitrate != 10 &&
148 sband->bitrates[i].bitrate != 20 &&
149 sband->bitrates[i].bitrate != 55 &&
150 sband->bitrates[i].bitrate != 110)
Johannes Berg8318d782008-01-24 19:38:38 +0100151 sband->bitrates[i].flags |=
152 IEEE80211_RATE_ERP_G;
153 }
Ivo van Doorn406f2382008-02-02 23:53:10 +0100154 WARN_ON(want != 0 && want != 3 && want != 6);
Johannes Berg8318d782008-01-24 19:38:38 +0100155 break;
Vladimir Kondratiev3a0c52a2012-07-02 09:32:32 +0300156 case IEEE80211_BAND_60GHZ:
157 /* check for mandatory HT MCS 1..4 */
158 WARN_ON(!sband->ht_cap.ht_supported);
159 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
160 break;
Johannes Berg8318d782008-01-24 19:38:38 +0100161 case IEEE80211_NUM_BANDS:
162 WARN_ON(1);
163 break;
164 }
165}
166
167void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
168{
169 enum ieee80211_band band;
170
171 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
172 if (wiphy->bands[band])
173 set_mandatory_flags_band(wiphy->bands[band], band);
174}
Johannes Berg08645122009-05-11 13:54:58 +0200175
Jouni Malinen38ba3c52011-09-21 18:14:56 +0300176bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
177{
178 int i;
179 for (i = 0; i < wiphy->n_cipher_suites; i++)
180 if (cipher == wiphy->cipher_suites[i])
181 return true;
182 return false;
183}
184
Johannes Bergfffd0932009-07-08 14:22:54 +0200185int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
186 struct key_params *params, int key_idx,
Johannes Berge31b8212010-10-05 19:39:30 +0200187 bool pairwise, const u8 *mac_addr)
Johannes Berg08645122009-05-11 13:54:58 +0200188{
189 if (key_idx > 5)
190 return -EINVAL;
191
Johannes Berge31b8212010-10-05 19:39:30 +0200192 if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
193 return -EINVAL;
194
195 if (pairwise && !mac_addr)
196 return -EINVAL;
197
Johannes Berg08645122009-05-11 13:54:58 +0200198 /*
199 * Disallow pairwise keys with non-zero index unless it's WEP
Juuso Oikarinen45cbad62011-01-25 12:21:22 +0200200 * or a vendor specific cipher (because current deployments use
201 * pairwise WEP keys with non-zero indices and for vendor specific
202 * ciphers this should be validated in the driver or hardware level
203 * - but 802.11i clearly specifies to use zero)
Johannes Berg08645122009-05-11 13:54:58 +0200204 */
Johannes Berge31b8212010-10-05 19:39:30 +0200205 if (pairwise && key_idx &&
Juuso Oikarinen45cbad62011-01-25 12:21:22 +0200206 ((params->cipher == WLAN_CIPHER_SUITE_TKIP) ||
207 (params->cipher == WLAN_CIPHER_SUITE_CCMP) ||
208 (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC)))
Johannes Berg08645122009-05-11 13:54:58 +0200209 return -EINVAL;
210
Johannes Berg08645122009-05-11 13:54:58 +0200211 switch (params->cipher) {
212 case WLAN_CIPHER_SUITE_WEP40:
Johannes Berg8fc0fee2009-05-24 16:57:19 +0200213 if (params->key_len != WLAN_KEY_LEN_WEP40)
Johannes Berg08645122009-05-11 13:54:58 +0200214 return -EINVAL;
215 break;
216 case WLAN_CIPHER_SUITE_TKIP:
Johannes Berg8fc0fee2009-05-24 16:57:19 +0200217 if (params->key_len != WLAN_KEY_LEN_TKIP)
Johannes Berg08645122009-05-11 13:54:58 +0200218 return -EINVAL;
219 break;
220 case WLAN_CIPHER_SUITE_CCMP:
Johannes Berg8fc0fee2009-05-24 16:57:19 +0200221 if (params->key_len != WLAN_KEY_LEN_CCMP)
Johannes Berg08645122009-05-11 13:54:58 +0200222 return -EINVAL;
223 break;
224 case WLAN_CIPHER_SUITE_WEP104:
Johannes Berg8fc0fee2009-05-24 16:57:19 +0200225 if (params->key_len != WLAN_KEY_LEN_WEP104)
Johannes Berg08645122009-05-11 13:54:58 +0200226 return -EINVAL;
227 break;
228 case WLAN_CIPHER_SUITE_AES_CMAC:
Johannes Berg8fc0fee2009-05-24 16:57:19 +0200229 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
Johannes Berg08645122009-05-11 13:54:58 +0200230 return -EINVAL;
231 break;
232 default:
Johannes Berg7d64b7c2010-08-27 14:26:51 +0300233 /*
234 * We don't know anything about this algorithm,
235 * allow using it -- but the driver must check
236 * all parameters! We still check below whether
237 * or not the driver supports this algorithm,
238 * of course.
239 */
240 break;
Johannes Berg08645122009-05-11 13:54:58 +0200241 }
242
Jouni Malinen9f26a952009-05-15 12:38:32 +0300243 if (params->seq) {
244 switch (params->cipher) {
245 case WLAN_CIPHER_SUITE_WEP40:
246 case WLAN_CIPHER_SUITE_WEP104:
247 /* These ciphers do not use key sequence */
248 return -EINVAL;
249 case WLAN_CIPHER_SUITE_TKIP:
250 case WLAN_CIPHER_SUITE_CCMP:
251 case WLAN_CIPHER_SUITE_AES_CMAC:
252 if (params->seq_len != 6)
253 return -EINVAL;
254 break;
255 }
256 }
257
Jouni Malinen38ba3c52011-09-21 18:14:56 +0300258 if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
Johannes Bergfffd0932009-07-08 14:22:54 +0200259 return -EINVAL;
260
Johannes Berg08645122009-05-11 13:54:58 +0200261 return 0;
262}
Zhu Yie31a16d2009-05-21 21:47:03 +0800263
Johannes Berg633adf12010-08-12 14:49:58 +0200264unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
Zhu Yie31a16d2009-05-21 21:47:03 +0800265{
266 unsigned int hdrlen = 24;
267
268 if (ieee80211_is_data(fc)) {
269 if (ieee80211_has_a4(fc))
270 hdrlen = 30;
Andriy Tkachukd0dd2de2010-01-20 13:55:06 +0200271 if (ieee80211_is_data_qos(fc)) {
Zhu Yie31a16d2009-05-21 21:47:03 +0800272 hdrlen += IEEE80211_QOS_CTL_LEN;
Andriy Tkachukd0dd2de2010-01-20 13:55:06 +0200273 if (ieee80211_has_order(fc))
274 hdrlen += IEEE80211_HT_CTL_LEN;
275 }
Zhu Yie31a16d2009-05-21 21:47:03 +0800276 goto out;
277 }
278
279 if (ieee80211_is_ctl(fc)) {
280 /*
281 * ACK and CTS are 10 bytes, all others 16. To see how
282 * to get this condition consider
283 * subtype mask: 0b0000000011110000 (0x00F0)
284 * ACK subtype: 0b0000000011010000 (0x00D0)
285 * CTS subtype: 0b0000000011000000 (0x00C0)
286 * bits that matter: ^^^ (0x00E0)
287 * value of those: 0b0000000011000000 (0x00C0)
288 */
289 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
290 hdrlen = 10;
291 else
292 hdrlen = 16;
293 }
294out:
295 return hdrlen;
296}
297EXPORT_SYMBOL(ieee80211_hdrlen);
298
299unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
300{
301 const struct ieee80211_hdr *hdr =
302 (const struct ieee80211_hdr *)skb->data;
303 unsigned int hdrlen;
304
305 if (unlikely(skb->len < 10))
306 return 0;
307 hdrlen = ieee80211_hdrlen(hdr->frame_control);
308 if (unlikely(hdrlen > skb->len))
309 return 0;
310 return hdrlen;
311}
312EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
313
Johannes Berg9b395bc2012-10-26 00:36:40 +0200314unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
Zhu Yie31a16d2009-05-21 21:47:03 +0800315{
316 int ae = meshhdr->flags & MESH_FLAGS_AE;
Johannes Berg7dd111e2012-10-25 21:51:59 +0200317 /* 802.11-2012, 8.2.4.7.3 */
Zhu Yie31a16d2009-05-21 21:47:03 +0800318 switch (ae) {
Johannes Berg7dd111e2012-10-25 21:51:59 +0200319 default:
Zhu Yie31a16d2009-05-21 21:47:03 +0800320 case 0:
321 return 6;
Javier Cardona3c5772a2009-08-10 12:15:48 -0700322 case MESH_FLAGS_AE_A4:
Zhu Yie31a16d2009-05-21 21:47:03 +0800323 return 12;
Javier Cardona3c5772a2009-08-10 12:15:48 -0700324 case MESH_FLAGS_AE_A5_A6:
Zhu Yie31a16d2009-05-21 21:47:03 +0800325 return 18;
Zhu Yie31a16d2009-05-21 21:47:03 +0800326 }
327}
Johannes Berg9b395bc2012-10-26 00:36:40 +0200328EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
Zhu Yie31a16d2009-05-21 21:47:03 +0800329
Zhu Yieaf85ca2009-12-01 10:18:37 +0800330int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
Zhu Yie31a16d2009-05-21 21:47:03 +0800331 enum nl80211_iftype iftype)
332{
333 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
334 u16 hdrlen, ethertype;
335 u8 *payload;
336 u8 dst[ETH_ALEN];
337 u8 src[ETH_ALEN] __aligned(2);
338
339 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
340 return -1;
341
342 hdrlen = ieee80211_hdrlen(hdr->frame_control);
343
344 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
345 * header
346 * IEEE 802.11 address fields:
347 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
348 * 0 0 DA SA BSSID n/a
349 * 0 1 DA BSSID SA n/a
350 * 1 0 BSSID SA DA n/a
351 * 1 1 RA TA DA SA
352 */
353 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
354 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
355
356 switch (hdr->frame_control &
357 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
358 case cpu_to_le16(IEEE80211_FCTL_TODS):
359 if (unlikely(iftype != NL80211_IFTYPE_AP &&
Johannes Berg074ac8d2010-09-16 14:58:22 +0200360 iftype != NL80211_IFTYPE_AP_VLAN &&
361 iftype != NL80211_IFTYPE_P2P_GO))
Zhu Yie31a16d2009-05-21 21:47:03 +0800362 return -1;
363 break;
364 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
365 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
Felix Fietkauf14543ee2009-11-10 20:10:05 +0100366 iftype != NL80211_IFTYPE_MESH_POINT &&
367 iftype != NL80211_IFTYPE_AP_VLAN &&
368 iftype != NL80211_IFTYPE_STATION))
Zhu Yie31a16d2009-05-21 21:47:03 +0800369 return -1;
370 if (iftype == NL80211_IFTYPE_MESH_POINT) {
371 struct ieee80211s_hdr *meshdr =
372 (struct ieee80211s_hdr *) (skb->data + hdrlen);
Zhu Yie3cf8b32010-03-29 17:35:07 +0800373 /* make sure meshdr->flags is on the linear part */
374 if (!pskb_may_pull(skb, hdrlen + 1))
375 return -1;
Johannes Berg7dd111e2012-10-25 21:51:59 +0200376 if (meshdr->flags & MESH_FLAGS_AE_A4)
377 return -1;
Zhu Yie31a16d2009-05-21 21:47:03 +0800378 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
Zhu Yie3cf8b32010-03-29 17:35:07 +0800379 skb_copy_bits(skb, hdrlen +
380 offsetof(struct ieee80211s_hdr, eaddr1),
381 dst, ETH_ALEN);
382 skb_copy_bits(skb, hdrlen +
383 offsetof(struct ieee80211s_hdr, eaddr2),
384 src, ETH_ALEN);
Zhu Yie31a16d2009-05-21 21:47:03 +0800385 }
Zhu Yie3cf8b32010-03-29 17:35:07 +0800386 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
Zhu Yie31a16d2009-05-21 21:47:03 +0800387 }
388 break;
389 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
Javier Cardona3c5772a2009-08-10 12:15:48 -0700390 if ((iftype != NL80211_IFTYPE_STATION &&
Johannes Berg074ac8d2010-09-16 14:58:22 +0200391 iftype != NL80211_IFTYPE_P2P_CLIENT &&
392 iftype != NL80211_IFTYPE_MESH_POINT) ||
Zhu Yie31a16d2009-05-21 21:47:03 +0800393 (is_multicast_ether_addr(dst) &&
Joe Perches4c764722012-05-08 18:56:56 +0000394 ether_addr_equal(src, addr)))
Zhu Yie31a16d2009-05-21 21:47:03 +0800395 return -1;
Javier Cardona3c5772a2009-08-10 12:15:48 -0700396 if (iftype == NL80211_IFTYPE_MESH_POINT) {
397 struct ieee80211s_hdr *meshdr =
398 (struct ieee80211s_hdr *) (skb->data + hdrlen);
Zhu Yie3cf8b32010-03-29 17:35:07 +0800399 /* make sure meshdr->flags is on the linear part */
400 if (!pskb_may_pull(skb, hdrlen + 1))
401 return -1;
Johannes Berg7dd111e2012-10-25 21:51:59 +0200402 if (meshdr->flags & MESH_FLAGS_AE_A5_A6)
403 return -1;
Javier Cardona3c5772a2009-08-10 12:15:48 -0700404 if (meshdr->flags & MESH_FLAGS_AE_A4)
Zhu Yie3cf8b32010-03-29 17:35:07 +0800405 skb_copy_bits(skb, hdrlen +
406 offsetof(struct ieee80211s_hdr, eaddr1),
407 src, ETH_ALEN);
408 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
Javier Cardona3c5772a2009-08-10 12:15:48 -0700409 }
Zhu Yie31a16d2009-05-21 21:47:03 +0800410 break;
411 case cpu_to_le16(0):
Arik Nemtsov941c93c2011-09-28 14:12:54 +0300412 if (iftype != NL80211_IFTYPE_ADHOC &&
413 iftype != NL80211_IFTYPE_STATION)
414 return -1;
Zhu Yie31a16d2009-05-21 21:47:03 +0800415 break;
416 }
417
Zhu Yie3cf8b32010-03-29 17:35:07 +0800418 if (!pskb_may_pull(skb, hdrlen + 8))
Zhu Yie31a16d2009-05-21 21:47:03 +0800419 return -1;
420
421 payload = skb->data + hdrlen;
422 ethertype = (payload[6] << 8) | payload[7];
423
Joe Perches4c764722012-05-08 18:56:56 +0000424 if (likely((ether_addr_equal(payload, rfc1042_header) &&
Zhu Yie31a16d2009-05-21 21:47:03 +0800425 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
Joe Perches4c764722012-05-08 18:56:56 +0000426 ether_addr_equal(payload, bridge_tunnel_header))) {
Zhu Yie31a16d2009-05-21 21:47:03 +0800427 /* remove RFC1042 or Bridge-Tunnel encapsulation and
428 * replace EtherType */
429 skb_pull(skb, hdrlen + 6);
430 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
431 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
432 } else {
433 struct ethhdr *ehdr;
434 __be16 len;
435
436 skb_pull(skb, hdrlen);
437 len = htons(skb->len);
438 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
439 memcpy(ehdr->h_dest, dst, ETH_ALEN);
440 memcpy(ehdr->h_source, src, ETH_ALEN);
441 ehdr->h_proto = len;
442 }
443 return 0;
444}
445EXPORT_SYMBOL(ieee80211_data_to_8023);
446
Zhu Yieaf85ca2009-12-01 10:18:37 +0800447int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
Zhu Yie31a16d2009-05-21 21:47:03 +0800448 enum nl80211_iftype iftype, u8 *bssid, bool qos)
449{
450 struct ieee80211_hdr hdr;
451 u16 hdrlen, ethertype;
452 __le16 fc;
453 const u8 *encaps_data;
454 int encaps_len, skip_header_bytes;
455 int nh_pos, h_pos;
456 int head_need;
457
458 if (unlikely(skb->len < ETH_HLEN))
459 return -EINVAL;
460
461 nh_pos = skb_network_header(skb) - skb->data;
462 h_pos = skb_transport_header(skb) - skb->data;
463
464 /* convert Ethernet header to proper 802.11 header (based on
465 * operation mode) */
466 ethertype = (skb->data[12] << 8) | skb->data[13];
467 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
468
469 switch (iftype) {
470 case NL80211_IFTYPE_AP:
471 case NL80211_IFTYPE_AP_VLAN:
Johannes Berg074ac8d2010-09-16 14:58:22 +0200472 case NL80211_IFTYPE_P2P_GO:
Zhu Yie31a16d2009-05-21 21:47:03 +0800473 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
474 /* DA BSSID SA */
475 memcpy(hdr.addr1, skb->data, ETH_ALEN);
476 memcpy(hdr.addr2, addr, ETH_ALEN);
477 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
478 hdrlen = 24;
479 break;
480 case NL80211_IFTYPE_STATION:
Johannes Berg074ac8d2010-09-16 14:58:22 +0200481 case NL80211_IFTYPE_P2P_CLIENT:
Zhu Yie31a16d2009-05-21 21:47:03 +0800482 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
483 /* BSSID SA DA */
484 memcpy(hdr.addr1, bssid, ETH_ALEN);
485 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
486 memcpy(hdr.addr3, skb->data, ETH_ALEN);
487 hdrlen = 24;
488 break;
489 case NL80211_IFTYPE_ADHOC:
490 /* DA SA BSSID */
491 memcpy(hdr.addr1, skb->data, ETH_ALEN);
492 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
493 memcpy(hdr.addr3, bssid, ETH_ALEN);
494 hdrlen = 24;
495 break;
496 default:
497 return -EOPNOTSUPP;
498 }
499
500 if (qos) {
501 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
502 hdrlen += 2;
503 }
504
505 hdr.frame_control = fc;
506 hdr.duration_id = 0;
507 hdr.seq_ctrl = 0;
508
509 skip_header_bytes = ETH_HLEN;
510 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
511 encaps_data = bridge_tunnel_header;
512 encaps_len = sizeof(bridge_tunnel_header);
513 skip_header_bytes -= 2;
514 } else if (ethertype > 0x600) {
515 encaps_data = rfc1042_header;
516 encaps_len = sizeof(rfc1042_header);
517 skip_header_bytes -= 2;
518 } else {
519 encaps_data = NULL;
520 encaps_len = 0;
521 }
522
523 skb_pull(skb, skip_header_bytes);
524 nh_pos -= skip_header_bytes;
525 h_pos -= skip_header_bytes;
526
527 head_need = hdrlen + encaps_len - skb_headroom(skb);
528
529 if (head_need > 0 || skb_cloned(skb)) {
530 head_need = max(head_need, 0);
531 if (head_need)
532 skb_orphan(skb);
533
Joe Perches24616152011-08-29 14:17:41 -0700534 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
Zhu Yie31a16d2009-05-21 21:47:03 +0800535 return -ENOMEM;
Joe Perches24616152011-08-29 14:17:41 -0700536
Zhu Yie31a16d2009-05-21 21:47:03 +0800537 skb->truesize += head_need;
538 }
539
540 if (encaps_data) {
541 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
542 nh_pos += encaps_len;
543 h_pos += encaps_len;
544 }
545
546 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
547
548 nh_pos += hdrlen;
549 h_pos += hdrlen;
550
551 /* Update skb pointers to various headers since this modified frame
552 * is going to go through Linux networking code that may potentially
553 * need things like pointer to IP header. */
554 skb_set_mac_header(skb, 0);
555 skb_set_network_header(skb, nh_pos);
556 skb_set_transport_header(skb, h_pos);
557
558 return 0;
559}
560EXPORT_SYMBOL(ieee80211_data_from_8023);
561
Zhu Yieaf85ca2009-12-01 10:18:37 +0800562
563void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
564 const u8 *addr, enum nl80211_iftype iftype,
Yogesh Ashok Powar8b3beca2011-05-13 11:22:31 -0700565 const unsigned int extra_headroom,
566 bool has_80211_header)
Zhu Yieaf85ca2009-12-01 10:18:37 +0800567{
568 struct sk_buff *frame = NULL;
569 u16 ethertype;
570 u8 *payload;
571 const struct ethhdr *eth;
572 int remaining, err;
573 u8 dst[ETH_ALEN], src[ETH_ALEN];
574
Yogesh Ashok Powar8b3beca2011-05-13 11:22:31 -0700575 if (has_80211_header) {
576 err = ieee80211_data_to_8023(skb, addr, iftype);
577 if (err)
578 goto out;
Zhu Yieaf85ca2009-12-01 10:18:37 +0800579
Yogesh Ashok Powar8b3beca2011-05-13 11:22:31 -0700580 /* skip the wrapping header */
581 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
582 if (!eth)
583 goto out;
584 } else {
585 eth = (struct ethhdr *) skb->data;
586 }
Zhu Yieaf85ca2009-12-01 10:18:37 +0800587
588 while (skb != frame) {
589 u8 padding;
590 __be16 len = eth->h_proto;
591 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
592
593 remaining = skb->len;
594 memcpy(dst, eth->h_dest, ETH_ALEN);
595 memcpy(src, eth->h_source, ETH_ALEN);
596
597 padding = (4 - subframe_len) & 0x3;
598 /* the last MSDU has no padding */
599 if (subframe_len > remaining)
600 goto purge;
601
602 skb_pull(skb, sizeof(struct ethhdr));
603 /* reuse skb for the last subframe */
604 if (remaining <= subframe_len + padding)
605 frame = skb;
606 else {
607 unsigned int hlen = ALIGN(extra_headroom, 4);
608 /*
609 * Allocate and reserve two bytes more for payload
610 * alignment since sizeof(struct ethhdr) is 14.
611 */
612 frame = dev_alloc_skb(hlen + subframe_len + 2);
613 if (!frame)
614 goto purge;
615
616 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
617 memcpy(skb_put(frame, ntohs(len)), skb->data,
618 ntohs(len));
619
620 eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
621 padding);
622 if (!eth) {
623 dev_kfree_skb(frame);
624 goto purge;
625 }
626 }
627
628 skb_reset_network_header(frame);
629 frame->dev = skb->dev;
630 frame->priority = skb->priority;
631
632 payload = frame->data;
633 ethertype = (payload[6] << 8) | payload[7];
634
Joe Perchesac422d32012-05-08 18:56:55 +0000635 if (likely((ether_addr_equal(payload, rfc1042_header) &&
Zhu Yieaf85ca2009-12-01 10:18:37 +0800636 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
Joe Perchesac422d32012-05-08 18:56:55 +0000637 ether_addr_equal(payload, bridge_tunnel_header))) {
Zhu Yieaf85ca2009-12-01 10:18:37 +0800638 /* remove RFC1042 or Bridge-Tunnel
639 * encapsulation and replace EtherType */
640 skb_pull(frame, 6);
641 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
642 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
643 } else {
644 memcpy(skb_push(frame, sizeof(__be16)), &len,
645 sizeof(__be16));
646 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
647 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
648 }
649 __skb_queue_tail(list, frame);
650 }
651
652 return;
653
654 purge:
655 __skb_queue_purge(list);
656 out:
657 dev_kfree_skb(skb);
658}
659EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
660
Zhu Yie31a16d2009-05-21 21:47:03 +0800661/* Given a data frame determine the 802.1p/1d tag to use. */
662unsigned int cfg80211_classify8021d(struct sk_buff *skb)
663{
664 unsigned int dscp;
665
666 /* skb->priority values from 256->263 are magic values to
667 * directly indicate a specific 802.1d priority. This is used
668 * to allow 802.1d priority to be passed directly in from VLAN
669 * tags, etc.
670 */
671 if (skb->priority >= 256 && skb->priority <= 263)
672 return skb->priority - 256;
673
674 switch (skb->protocol) {
675 case htons(ETH_P_IP):
Dave Tähtb1565792011-12-22 12:55:08 -0800676 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
677 break;
678 case htons(ETH_P_IPV6):
679 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
Zhu Yie31a16d2009-05-21 21:47:03 +0800680 break;
681 default:
682 return 0;
683 }
684
685 return dscp >> 5;
686}
687EXPORT_SYMBOL(cfg80211_classify8021d);
Johannes Berg517357c2009-07-02 17:18:40 +0200688
689const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
690{
Johannes Berg9caf0362012-11-29 01:25:20 +0100691 const struct cfg80211_bss_ies *ies;
692
693 ies = rcu_dereference(bss->ies);
694 if (!ies)
Johannes Berg517357c2009-07-02 17:18:40 +0200695 return NULL;
Johannes Berg9caf0362012-11-29 01:25:20 +0100696
697 return cfg80211_find_ie(ie, ies->data, ies->len);
Johannes Berg517357c2009-07-02 17:18:40 +0200698}
699EXPORT_SYMBOL(ieee80211_bss_get_ie);
Johannes Bergfffd0932009-07-08 14:22:54 +0200700
701void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
702{
703 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
704 struct net_device *dev = wdev->netdev;
705 int i;
706
707 if (!wdev->connect_keys)
708 return;
709
710 for (i = 0; i < 6; i++) {
711 if (!wdev->connect_keys->params[i].cipher)
712 continue;
Hila Gonene35e4d22012-06-27 17:19:42 +0300713 if (rdev_add_key(rdev, dev, i, false, NULL,
714 &wdev->connect_keys->params[i])) {
Joe Perchese9c02682010-11-16 19:56:49 -0800715 netdev_err(dev, "failed to set key %d\n", i);
Zhu Yi1e056662009-07-20 16:12:57 +0800716 continue;
717 }
Johannes Bergfffd0932009-07-08 14:22:54 +0200718 if (wdev->connect_keys->def == i)
Hila Gonene35e4d22012-06-27 17:19:42 +0300719 if (rdev_set_default_key(rdev, dev, i, true, true)) {
Joe Perchese9c02682010-11-16 19:56:49 -0800720 netdev_err(dev, "failed to set defkey %d\n", i);
Zhu Yi1e056662009-07-20 16:12:57 +0800721 continue;
722 }
Johannes Bergfffd0932009-07-08 14:22:54 +0200723 if (wdev->connect_keys->defmgmt == i)
Hila Gonene35e4d22012-06-27 17:19:42 +0300724 if (rdev_set_default_mgmt_key(rdev, dev, i))
Joe Perchese9c02682010-11-16 19:56:49 -0800725 netdev_err(dev, "failed to set mgtdef %d\n", i);
Johannes Bergfffd0932009-07-08 14:22:54 +0200726 }
727
728 kfree(wdev->connect_keys);
729 wdev->connect_keys = NULL;
730}
Johannes Berg3d54d252009-08-21 14:51:05 +0200731
Daniel Drake1f6fc432012-08-02 18:41:48 +0100732void cfg80211_process_wdev_events(struct wireless_dev *wdev)
Johannes Berg3d54d252009-08-21 14:51:05 +0200733{
734 struct cfg80211_event *ev;
735 unsigned long flags;
736 const u8 *bssid = NULL;
737
738 spin_lock_irqsave(&wdev->event_lock, flags);
739 while (!list_empty(&wdev->event_list)) {
740 ev = list_first_entry(&wdev->event_list,
741 struct cfg80211_event, list);
742 list_del(&ev->list);
743 spin_unlock_irqrestore(&wdev->event_lock, flags);
744
745 wdev_lock(wdev);
746 switch (ev->type) {
747 case EVENT_CONNECT_RESULT:
748 if (!is_zero_ether_addr(ev->cr.bssid))
749 bssid = ev->cr.bssid;
750 __cfg80211_connect_result(
751 wdev->netdev, bssid,
752 ev->cr.req_ie, ev->cr.req_ie_len,
753 ev->cr.resp_ie, ev->cr.resp_ie_len,
754 ev->cr.status,
755 ev->cr.status == WLAN_STATUS_SUCCESS,
756 NULL);
757 break;
758 case EVENT_ROAMED:
Vasanthakumar Thiagarajanadbde342011-12-08 14:28:47 +0530759 __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
760 ev->rm.req_ie_len, ev->rm.resp_ie,
761 ev->rm.resp_ie_len);
Johannes Berg3d54d252009-08-21 14:51:05 +0200762 break;
763 case EVENT_DISCONNECTED:
764 __cfg80211_disconnected(wdev->netdev,
765 ev->dc.ie, ev->dc.ie_len,
766 ev->dc.reason, true);
767 break;
768 case EVENT_IBSS_JOINED:
769 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
770 break;
771 }
772 wdev_unlock(wdev);
773
774 kfree(ev);
775
776 spin_lock_irqsave(&wdev->event_lock, flags);
777 }
778 spin_unlock_irqrestore(&wdev->event_lock, flags);
779}
780
781void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
782{
783 struct wireless_dev *wdev;
784
785 ASSERT_RTNL();
786 ASSERT_RDEV_LOCK(rdev);
787
788 mutex_lock(&rdev->devlist_mtx);
789
Johannes Berg89a54e42012-06-15 14:33:17 +0200790 list_for_each_entry(wdev, &rdev->wdev_list, list)
Johannes Berg3d54d252009-08-21 14:51:05 +0200791 cfg80211_process_wdev_events(wdev);
792
793 mutex_unlock(&rdev->devlist_mtx);
794}
795
796int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
797 struct net_device *dev, enum nl80211_iftype ntype,
798 u32 *flags, struct vif_params *params)
799{
800 int err;
801 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
802
803 ASSERT_RDEV_LOCK(rdev);
804
805 /* don't support changing VLANs, you just re-create them */
806 if (otype == NL80211_IFTYPE_AP_VLAN)
807 return -EOPNOTSUPP;
808
Johannes Berg98104fde2012-06-16 00:19:54 +0200809 /* cannot change into P2P device type */
810 if (ntype == NL80211_IFTYPE_P2P_DEVICE)
811 return -EOPNOTSUPP;
812
Johannes Berg3d54d252009-08-21 14:51:05 +0200813 if (!rdev->ops->change_virtual_intf ||
814 !(rdev->wiphy.interface_modes & (1 << ntype)))
815 return -EOPNOTSUPP;
816
Johannes Bergad4bb6f2009-11-19 00:56:30 +0100817 /* if it's part of a bridge, reject changing type to station/ibss */
Jiri Pirkof350a0a82010-06-15 06:50:45 +0000818 if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
Johannes Berg074ac8d2010-09-16 14:58:22 +0200819 (ntype == NL80211_IFTYPE_ADHOC ||
820 ntype == NL80211_IFTYPE_STATION ||
821 ntype == NL80211_IFTYPE_P2P_CLIENT))
Johannes Bergad4bb6f2009-11-19 00:56:30 +0100822 return -EBUSY;
823
Michal Kaziorf8cdddb2012-06-08 10:55:44 +0200824 if (ntype != otype && netif_running(dev)) {
Michal Kaziore4e32452012-06-29 12:47:08 +0200825 mutex_lock(&rdev->devlist_mtx);
Johannes Berg7527a782011-05-13 10:58:57 +0200826 err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr,
827 ntype);
Michal Kaziore4e32452012-06-29 12:47:08 +0200828 mutex_unlock(&rdev->devlist_mtx);
Johannes Berg7527a782011-05-13 10:58:57 +0200829 if (err)
830 return err;
831
Johannes Berg9bc383d2009-11-19 11:55:19 +0100832 dev->ieee80211_ptr->use_4addr = false;
Johannes Berg29cbe682010-12-03 09:20:44 +0100833 dev->ieee80211_ptr->mesh_id_up_len = 0;
Johannes Berg9bc383d2009-11-19 11:55:19 +0100834
Johannes Berg3d54d252009-08-21 14:51:05 +0200835 switch (otype) {
Michal Kaziorac800142012-06-29 12:46:57 +0200836 case NL80211_IFTYPE_AP:
837 cfg80211_stop_ap(rdev, dev);
838 break;
Johannes Berg3d54d252009-08-21 14:51:05 +0200839 case NL80211_IFTYPE_ADHOC:
840 cfg80211_leave_ibss(rdev, dev, false);
841 break;
842 case NL80211_IFTYPE_STATION:
Johannes Berg074ac8d2010-09-16 14:58:22 +0200843 case NL80211_IFTYPE_P2P_CLIENT:
Johannes Berg3d54d252009-08-21 14:51:05 +0200844 cfg80211_disconnect(rdev, dev,
845 WLAN_REASON_DEAUTH_LEAVING, true);
846 break;
847 case NL80211_IFTYPE_MESH_POINT:
848 /* mesh should be handled? */
849 break;
850 default:
851 break;
852 }
853
854 cfg80211_process_rdev_events(rdev);
855 }
856
Hila Gonene35e4d22012-06-27 17:19:42 +0300857 err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);
Johannes Berg3d54d252009-08-21 14:51:05 +0200858
859 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
860
Johannes Berg9bc383d2009-11-19 11:55:19 +0100861 if (!err && params && params->use_4addr != -1)
862 dev->ieee80211_ptr->use_4addr = params->use_4addr;
863
Johannes Bergad4bb6f2009-11-19 00:56:30 +0100864 if (!err) {
865 dev->priv_flags &= ~IFF_DONT_BRIDGE;
866 switch (ntype) {
867 case NL80211_IFTYPE_STATION:
868 if (dev->ieee80211_ptr->use_4addr)
869 break;
870 /* fall through */
Johannes Berg074ac8d2010-09-16 14:58:22 +0200871 case NL80211_IFTYPE_P2P_CLIENT:
Johannes Bergad4bb6f2009-11-19 00:56:30 +0100872 case NL80211_IFTYPE_ADHOC:
873 dev->priv_flags |= IFF_DONT_BRIDGE;
874 break;
Johannes Berg074ac8d2010-09-16 14:58:22 +0200875 case NL80211_IFTYPE_P2P_GO:
Johannes Bergad4bb6f2009-11-19 00:56:30 +0100876 case NL80211_IFTYPE_AP:
877 case NL80211_IFTYPE_AP_VLAN:
878 case NL80211_IFTYPE_WDS:
879 case NL80211_IFTYPE_MESH_POINT:
880 /* bridging OK */
881 break;
882 case NL80211_IFTYPE_MONITOR:
883 /* monitor can't bridge anyway */
884 break;
885 case NL80211_IFTYPE_UNSPECIFIED:
Johannes Berg2e161f72010-08-12 15:38:38 +0200886 case NUM_NL80211_IFTYPES:
Johannes Bergad4bb6f2009-11-19 00:56:30 +0100887 /* not happening */
888 break;
Johannes Berg98104fde2012-06-16 00:19:54 +0200889 case NL80211_IFTYPE_P2P_DEVICE:
890 WARN_ON(1);
891 break;
Johannes Bergad4bb6f2009-11-19 00:56:30 +0100892 }
893 }
894
Michal Kaziordbbae262012-06-29 12:47:01 +0200895 if (!err && ntype != otype && netif_running(dev)) {
896 cfg80211_update_iface_num(rdev, ntype, 1);
897 cfg80211_update_iface_num(rdev, otype, -1);
898 }
899
Johannes Berg3d54d252009-08-21 14:51:05 +0200900 return err;
901}
John W. Linville254416a2009-12-09 16:43:52 -0500902
Vladimir Kondratiev95ddc1f2012-07-05 14:25:50 +0300903static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
904{
905 static const u32 __mcs2bitrate[] = {
906 /* control PHY */
907 [0] = 275,
908 /* SC PHY */
909 [1] = 3850,
910 [2] = 7700,
911 [3] = 9625,
912 [4] = 11550,
913 [5] = 12512, /* 1251.25 mbps */
914 [6] = 15400,
915 [7] = 19250,
916 [8] = 23100,
917 [9] = 25025,
918 [10] = 30800,
919 [11] = 38500,
920 [12] = 46200,
921 /* OFDM PHY */
922 [13] = 6930,
923 [14] = 8662, /* 866.25 mbps */
924 [15] = 13860,
925 [16] = 17325,
926 [17] = 20790,
927 [18] = 27720,
928 [19] = 34650,
929 [20] = 41580,
930 [21] = 45045,
931 [22] = 51975,
932 [23] = 62370,
933 [24] = 67568, /* 6756.75 mbps */
934 /* LP-SC PHY */
935 [25] = 6260,
936 [26] = 8340,
937 [27] = 11120,
938 [28] = 12510,
939 [29] = 16680,
940 [30] = 22240,
941 [31] = 25030,
942 };
943
944 if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
945 return 0;
946
947 return __mcs2bitrate[rate->mcs];
948}
949
Johannes Bergdb9c64c2012-11-09 14:56:41 +0100950static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
951{
952 static const u32 base[4][10] = {
953 { 6500000,
954 13000000,
955 19500000,
956 26000000,
957 39000000,
958 52000000,
959 58500000,
960 65000000,
961 78000000,
962 0,
963 },
964 { 13500000,
965 27000000,
966 40500000,
967 54000000,
968 81000000,
969 108000000,
970 121500000,
971 135000000,
972 162000000,
973 180000000,
974 },
975 { 29300000,
976 58500000,
977 87800000,
978 117000000,
979 175500000,
980 234000000,
981 263300000,
982 292500000,
983 351000000,
984 390000000,
985 },
986 { 58500000,
987 117000000,
988 175500000,
989 234000000,
990 351000000,
991 468000000,
992 526500000,
993 585000000,
994 702000000,
995 780000000,
996 },
997 };
998 u32 bitrate;
999 int idx;
1000
1001 if (WARN_ON_ONCE(rate->mcs > 9))
1002 return 0;
1003
1004 idx = rate->flags & (RATE_INFO_FLAGS_160_MHZ_WIDTH |
1005 RATE_INFO_FLAGS_80P80_MHZ_WIDTH) ? 3 :
1006 rate->flags & RATE_INFO_FLAGS_80_MHZ_WIDTH ? 2 :
1007 rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH ? 1 : 0;
1008
1009 bitrate = base[idx][rate->mcs];
1010 bitrate *= rate->nss;
1011
1012 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1013 bitrate = (bitrate / 9) * 10;
1014
1015 /* do NOT round down here */
1016 return (bitrate + 50000) / 100000;
1017}
1018
Vladimir Kondratiev8eb41c82012-07-05 14:25:49 +03001019u32 cfg80211_calculate_bitrate(struct rate_info *rate)
John W. Linville254416a2009-12-09 16:43:52 -05001020{
1021 int modulation, streams, bitrate;
1022
Johannes Bergdb9c64c2012-11-09 14:56:41 +01001023 if (!(rate->flags & RATE_INFO_FLAGS_MCS) &&
1024 !(rate->flags & RATE_INFO_FLAGS_VHT_MCS))
John W. Linville254416a2009-12-09 16:43:52 -05001025 return rate->legacy;
Vladimir Kondratiev95ddc1f2012-07-05 14:25:50 +03001026 if (rate->flags & RATE_INFO_FLAGS_60G)
1027 return cfg80211_calculate_bitrate_60g(rate);
Johannes Bergdb9c64c2012-11-09 14:56:41 +01001028 if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1029 return cfg80211_calculate_bitrate_vht(rate);
John W. Linville254416a2009-12-09 16:43:52 -05001030
1031 /* the formula below does only work for MCS values smaller than 32 */
Johannes Berg2615f372012-05-08 21:36:20 +02001032 if (WARN_ON_ONCE(rate->mcs >= 32))
John W. Linville254416a2009-12-09 16:43:52 -05001033 return 0;
1034
1035 modulation = rate->mcs & 7;
1036 streams = (rate->mcs >> 3) + 1;
1037
1038 bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
1039 13500000 : 6500000;
1040
1041 if (modulation < 4)
1042 bitrate *= (modulation + 1);
1043 else if (modulation == 4)
1044 bitrate *= (modulation + 2);
1045 else
1046 bitrate *= (modulation + 3);
1047
1048 bitrate *= streams;
1049
1050 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1051 bitrate = (bitrate / 9) * 10;
1052
1053 /* do NOT round down here */
1054 return (bitrate + 50000) / 100000;
1055}
Thomas Pedersen8097e142012-03-05 15:31:47 -08001056EXPORT_SYMBOL(cfg80211_calculate_bitrate);
Johannes Berg56d18932011-05-09 18:41:15 +02001057
Arend van Sprielc216e642012-11-25 19:13:28 +01001058int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1059 enum ieee80211_p2p_attr_id attr,
1060 u8 *buf, unsigned int bufsize)
Johannes Berg0ee45352012-10-29 19:48:40 +01001061{
1062 u8 *out = buf;
1063 u16 attr_remaining = 0;
1064 bool desired_attr = false;
1065 u16 desired_len = 0;
1066
1067 while (len > 0) {
1068 unsigned int iedatalen;
1069 unsigned int copy;
1070 const u8 *iedata;
1071
1072 if (len < 2)
1073 return -EILSEQ;
1074 iedatalen = ies[1];
1075 if (iedatalen + 2 > len)
1076 return -EILSEQ;
1077
1078 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1079 goto cont;
1080
1081 if (iedatalen < 4)
1082 goto cont;
1083
1084 iedata = ies + 2;
1085
1086 /* check WFA OUI, P2P subtype */
1087 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1088 iedata[2] != 0x9a || iedata[3] != 0x09)
1089 goto cont;
1090
1091 iedatalen -= 4;
1092 iedata += 4;
1093
1094 /* check attribute continuation into this IE */
1095 copy = min_t(unsigned int, attr_remaining, iedatalen);
1096 if (copy && desired_attr) {
1097 desired_len += copy;
1098 if (out) {
1099 memcpy(out, iedata, min(bufsize, copy));
1100 out += min(bufsize, copy);
1101 bufsize -= min(bufsize, copy);
1102 }
1103
1104
1105 if (copy == attr_remaining)
1106 return desired_len;
1107 }
1108
1109 attr_remaining -= copy;
1110 if (attr_remaining)
1111 goto cont;
1112
1113 iedatalen -= copy;
1114 iedata += copy;
1115
1116 while (iedatalen > 0) {
1117 u16 attr_len;
1118
1119 /* P2P attribute ID & size must fit */
1120 if (iedatalen < 3)
1121 return -EILSEQ;
1122 desired_attr = iedata[0] == attr;
1123 attr_len = get_unaligned_le16(iedata + 1);
1124 iedatalen -= 3;
1125 iedata += 3;
1126
1127 copy = min_t(unsigned int, attr_len, iedatalen);
1128
1129 if (desired_attr) {
1130 desired_len += copy;
1131 if (out) {
1132 memcpy(out, iedata, min(bufsize, copy));
1133 out += min(bufsize, copy);
1134 bufsize -= min(bufsize, copy);
1135 }
1136
1137 if (copy == attr_len)
1138 return desired_len;
1139 }
1140
1141 iedata += copy;
1142 iedatalen -= copy;
1143 attr_remaining = attr_len - copy;
1144 }
1145
1146 cont:
1147 len -= ies[1] + 2;
1148 ies += ies[1] + 2;
1149 }
1150
1151 if (attr_remaining && desired_attr)
1152 return -EILSEQ;
1153
1154 return -ENOENT;
1155}
1156EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1157
Johannes Berg56d18932011-05-09 18:41:15 +02001158int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1159 u32 beacon_int)
1160{
1161 struct wireless_dev *wdev;
1162 int res = 0;
1163
1164 if (!beacon_int)
1165 return -EINVAL;
1166
1167 mutex_lock(&rdev->devlist_mtx);
1168
Johannes Berg89a54e42012-06-15 14:33:17 +02001169 list_for_each_entry(wdev, &rdev->wdev_list, list) {
Johannes Berg56d18932011-05-09 18:41:15 +02001170 if (!wdev->beacon_interval)
1171 continue;
1172 if (wdev->beacon_interval != beacon_int) {
1173 res = -EINVAL;
1174 break;
1175 }
1176 }
1177
1178 mutex_unlock(&rdev->devlist_mtx);
1179
1180 return res;
1181}
Johannes Berg7527a782011-05-13 10:58:57 +02001182
Michal Kaziord4e50c52012-06-29 12:47:07 +02001183int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
1184 struct wireless_dev *wdev,
1185 enum nl80211_iftype iftype,
1186 struct ieee80211_channel *chan,
1187 enum cfg80211_chan_mode chanmode)
Johannes Berg7527a782011-05-13 10:58:57 +02001188{
1189 struct wireless_dev *wdev_iter;
Johannes Berg463454b2012-06-05 12:16:50 +02001190 u32 used_iftypes = BIT(iftype);
Johannes Berg7527a782011-05-13 10:58:57 +02001191 int num[NUM_NL80211_IFTYPES];
Michal Kaziord4e50c52012-06-29 12:47:07 +02001192 struct ieee80211_channel
1193 *used_channels[CFG80211_MAX_NUM_DIFFERENT_CHANNELS];
1194 struct ieee80211_channel *ch;
1195 enum cfg80211_chan_mode chmode;
1196 int num_different_channels = 0;
Johannes Berg7527a782011-05-13 10:58:57 +02001197 int total = 1;
1198 int i, j;
1199
1200 ASSERT_RTNL();
Michal Kaziore4e32452012-06-29 12:47:08 +02001201 lockdep_assert_held(&rdev->devlist_mtx);
Johannes Berg7527a782011-05-13 10:58:57 +02001202
1203 /* Always allow software iftypes */
1204 if (rdev->wiphy.software_iftypes & BIT(iftype))
1205 return 0;
1206
Johannes Berg7527a782011-05-13 10:58:57 +02001207 memset(num, 0, sizeof(num));
Michal Kaziord4e50c52012-06-29 12:47:07 +02001208 memset(used_channels, 0, sizeof(used_channels));
Johannes Berg7527a782011-05-13 10:58:57 +02001209
1210 num[iftype] = 1;
1211
Michal Kaziord4e50c52012-06-29 12:47:07 +02001212 switch (chanmode) {
1213 case CHAN_MODE_UNDEFINED:
1214 break;
1215 case CHAN_MODE_SHARED:
1216 WARN_ON(!chan);
1217 used_channels[0] = chan;
1218 num_different_channels++;
1219 break;
1220 case CHAN_MODE_EXCLUSIVE:
1221 num_different_channels++;
1222 break;
1223 }
1224
Johannes Berg89a54e42012-06-15 14:33:17 +02001225 list_for_each_entry(wdev_iter, &rdev->wdev_list, list) {
Johannes Berg7527a782011-05-13 10:58:57 +02001226 if (wdev_iter == wdev)
1227 continue;
Johannes Berg98104fde2012-06-16 00:19:54 +02001228 if (wdev_iter->netdev) {
1229 if (!netif_running(wdev_iter->netdev))
1230 continue;
1231 } else if (wdev_iter->iftype == NL80211_IFTYPE_P2P_DEVICE) {
1232 if (!wdev_iter->p2p_started)
1233 continue;
1234 } else {
1235 WARN_ON(1);
1236 }
Johannes Berg7527a782011-05-13 10:58:57 +02001237
1238 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
1239 continue;
1240
Johannes Berg8e95ea42012-07-10 19:39:02 +02001241 /*
1242 * We may be holding the "wdev" mutex, but now need to lock
1243 * wdev_iter. This is OK because once we get here wdev_iter
1244 * is not wdev (tested above), but we need to use the nested
1245 * locking for lockdep.
1246 */
1247 mutex_lock_nested(&wdev_iter->mtx, 1);
1248 __acquire(wdev_iter->mtx);
1249 cfg80211_get_chan_state(wdev_iter, &ch, &chmode);
1250 wdev_unlock(wdev_iter);
Michal Kaziord4e50c52012-06-29 12:47:07 +02001251
1252 switch (chmode) {
1253 case CHAN_MODE_UNDEFINED:
1254 break;
1255 case CHAN_MODE_SHARED:
1256 for (i = 0; i < CFG80211_MAX_NUM_DIFFERENT_CHANNELS; i++)
1257 if (!used_channels[i] || used_channels[i] == ch)
1258 break;
1259
Michal Kaziore4e32452012-06-29 12:47:08 +02001260 if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS)
Michal Kaziord4e50c52012-06-29 12:47:07 +02001261 return -EBUSY;
Michal Kaziord4e50c52012-06-29 12:47:07 +02001262
1263 if (used_channels[i] == NULL) {
1264 used_channels[i] = ch;
1265 num_different_channels++;
1266 }
1267 break;
1268 case CHAN_MODE_EXCLUSIVE:
1269 num_different_channels++;
1270 break;
1271 }
1272
Johannes Berg7527a782011-05-13 10:58:57 +02001273 num[wdev_iter->iftype]++;
1274 total++;
Johannes Berg463454b2012-06-05 12:16:50 +02001275 used_iftypes |= BIT(wdev_iter->iftype);
Johannes Berg7527a782011-05-13 10:58:57 +02001276 }
Johannes Berg7527a782011-05-13 10:58:57 +02001277
Johannes Berg8e8b41f2012-03-15 10:16:16 +01001278 if (total == 1)
1279 return 0;
1280
Johannes Berg7527a782011-05-13 10:58:57 +02001281 for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) {
1282 const struct ieee80211_iface_combination *c;
1283 struct ieee80211_iface_limit *limits;
Johannes Berg463454b2012-06-05 12:16:50 +02001284 u32 all_iftypes = 0;
Johannes Berg7527a782011-05-13 10:58:57 +02001285
1286 c = &rdev->wiphy.iface_combinations[i];
1287
Michal Kaziord4e50c52012-06-29 12:47:07 +02001288 if (total > c->max_interfaces)
1289 continue;
1290 if (num_different_channels > c->num_different_channels)
1291 continue;
1292
Johannes Berg7527a782011-05-13 10:58:57 +02001293 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1294 GFP_KERNEL);
1295 if (!limits)
1296 return -ENOMEM;
Johannes Berg7527a782011-05-13 10:58:57 +02001297
1298 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1299 if (rdev->wiphy.software_iftypes & BIT(iftype))
1300 continue;
1301 for (j = 0; j < c->n_limits; j++) {
Johannes Berg463454b2012-06-05 12:16:50 +02001302 all_iftypes |= limits[j].types;
Lukasz Kucharczyke55a4042012-04-11 14:55:10 +02001303 if (!(limits[j].types & BIT(iftype)))
Johannes Berg7527a782011-05-13 10:58:57 +02001304 continue;
1305 if (limits[j].max < num[iftype])
1306 goto cont;
1307 limits[j].max -= num[iftype];
1308 }
1309 }
Johannes Berg463454b2012-06-05 12:16:50 +02001310
1311 /*
1312 * Finally check that all iftypes that we're currently
1313 * using are actually part of this combination. If they
1314 * aren't then we can't use this combination and have
1315 * to continue to the next.
1316 */
1317 if ((all_iftypes & used_iftypes) != used_iftypes)
1318 goto cont;
1319
1320 /*
1321 * This combination covered all interface types and
1322 * supported the requested numbers, so we're good.
1323 */
Johannes Berg7527a782011-05-13 10:58:57 +02001324 kfree(limits);
1325 return 0;
1326 cont:
1327 kfree(limits);
1328 }
1329
1330 return -EBUSY;
1331}
Johannes Berg34850ab2011-07-18 18:08:35 +02001332
1333int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1334 const u8 *rates, unsigned int n_rates,
1335 u32 *mask)
1336{
1337 int i, j;
1338
Johannes Berga401d2b2011-07-20 00:52:16 +02001339 if (!sband)
1340 return -EINVAL;
1341
Johannes Berg34850ab2011-07-18 18:08:35 +02001342 if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1343 return -EINVAL;
1344
1345 *mask = 0;
1346
1347 for (i = 0; i < n_rates; i++) {
1348 int rate = (rates[i] & 0x7f) * 5;
1349 bool found = false;
1350
1351 for (j = 0; j < sband->n_bitrates; j++) {
1352 if (sband->bitrates[j].bitrate == rate) {
1353 found = true;
1354 *mask |= BIT(j);
1355 break;
1356 }
1357 }
1358 if (!found)
1359 return -EINVAL;
1360 }
1361
1362 /*
1363 * mask must have at least one bit set here since we
1364 * didn't accept a 0-length rates array nor allowed
1365 * entries in the array that didn't exist
1366 */
1367
1368 return 0;
1369}
Johannes Berg11a2a352011-11-21 11:09:22 +01001370
1371/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1372/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1373const unsigned char rfc1042_header[] __aligned(2) =
1374 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1375EXPORT_SYMBOL(rfc1042_header);
1376
1377/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1378const unsigned char bridge_tunnel_header[] __aligned(2) =
1379 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1380EXPORT_SYMBOL(bridge_tunnel_header);